Pulp-feeding device for paper-machines.



Pm MG BOB PAPER mm im.

AEPLEUA'TION FILED ATB. 3.5., 1997..

E. F. MILLARD.

PULP FEEDING DEVICE FOR PAPER MACHINES.

APPLIGATIOH rIL'BD ME45, 1907.

2 SHEETS-SHEET 2.

pressure may be varied by any suitable exdisturb the fibers, the result being the fory mation of a better matte, without departing a' secondary feature, ywith means for regu- .section on the line w3 of `Fig. 1; and Fig Liis PATENT oE-EioE.

EDWARD F. MILLARD, OF WATERTOWN, MASSACHUSETTS.

PULP-FEEDING DEVICE FOB PAPER-MACHINES.

Application led April 15,

Specication of Letters Patent.

1907. Serial No. 368,201.

To all whom 'it may concern: e

Be it known that I, EDWARD F. MILLARD, a citizen of the United States, residing in Watertown, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Pul -Feeding Devices for Paper-Machines, ofw ich the following description, inconnection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

The present invention 'relates to a Fourdrinier paper machine, and is embodied in novel means for feeding the liquid pulp to the wire part of the machine, the purpose of the invention being to give the pulp a certain velocity as nearly aspossible equal to the velocity of movement of the wire, so that the pul' and the wire are in eect stationary re ative to each other,` although they travel together. This results in the draining of the pulp without any dragging movement of the wire against the pulp to from the continuous process provided for by the use of the machine.

In carrying out the invention, the machine is provided .with means for causing the pulp to iow or travel from the suppl tank to the Wire, and may also be provi ed, as

lating the velocity of iow of the pulp and causing it to approximately equal thev velocit? of movement of the wire. The velocity o feed movement may be accomplished by providing the feed tank, in which the pulp 1s kept stirred up, with an inclined runway which extends from the tank to a point over the wire where it leaves the breast roll of` the machine, or with means for causing the pulp to flow under a head or pressure. For purposes of adjustment, the runway may be arranged so as to vary the inclination thereof, or a vertically adjustable dam may be employed to vary the head; or the head or pedient.

Figure 1 is a side elevation, partly in section, of the breast roll end of a Fourdrinier paper machine provided with feedin mechanism constructed in accordance with the invention; Fig. 2 is a front elevation of the feed mechanism, the trough or runway Abeing shown in section; Fig. 3 is a horizontal vbreast roll A2 over whlch cation. .l

In operating a Fonrdriniermachine, the liquid pulp is owed on to the surface of the traveling'wire A ata int Vadjacent to the the'wire travels, it being: customary to cause the pulp to empt from a tank, the surface level and ove ow int of which are substantially on a level with the wire A. The pulp inthis case is substantially stationary, that is to livered to the wire, and isdragged along by the wire in the draining anddrying rocess. In order to give the pulp an initial) velocity of flow, so that it tends to travel. with the, Wire, instead of being drag d along'thereby, the machine is provided in accordance with this invention, with means forgiving the pulp such initial velocity, for example, by providing the apparatus with a Patented Sept. 7,1909.

has no initial velocity, when it .is (le-- a View similar to Fig. 1, Showing s maisgravit feed such as an inclined trough down the pulp flows to the wire.

In the construction 1 Ato 3, ythe tank a, which is kept supplied withk a quantity of pulp, is provided with a vertically movable dam b provided at the top with a runway or trough c extend' -from the top of the dam or the overiow own ztotlie surface of the wire A. The pulp overiowing from the tank therefore, and runmng v ydown the trough, will acquire a certainvelocity which ma be regulated by varying the inclination o the trough, until it substantially equals the velocity of movementvof the wire A. In the construction shown, the

trough c is hinged at c2 to the top of the dam b, and is 1provided at its lower end. with a f flexible apron c3 which lies in contact with the wire A so as tribute itself evenly over the wire.

To vary the inclination of the trough yc,

to permit the 'pulp to disthe dam b is vertically movable, being shown as provided pinion ba arranged to be operated by a hand wheel b4. The dam maybe fitted into the wall of' the tank in anyy suitable way, the tank being herein shown, as formed with recesses a2 ait opposite sides in which the opposite ends of the dam "b nt with suiiicient with a rack b2 in mesh with the accuracy to prevent leakage. It is sometimes desirable to draw off the .pulp from a level belowthe surface thereof, soasto prevent any foamy substance floating on'top from reaching the wire, and a supplemental ad- A just'able cut-off b5 operated for adjustment by` a hand-wheel b, 1s herein shown for the purpose of regulating the sizeuof the open- ',ing. The trough c 1s shown as supported at its lower end upon a stationary crossmember C, so that the Atrough will not be shaken by the Vibratory vmovement of the shake-rails. vThe desired end may be obtained Without the intervention of the 1n- Vclined troulgh by otherwise vproviding for flow ofu p under pressure or head. As shown, or. example, in Fig. 4, the liquid -may be maintained in the tank at a level vc2" to the horizonta above the level of the wire, by means of the dam b1", which pro'ects' above the opening i trough 01, so that the liquid pulp is delivered under ahead detervmlned by the height of-'the top of the dam b1", which may, as indicated, be adjustable. Itis obvious, moreover, that by regulating the size of the opening, shown in Fig. 1, be-

tween the dams b and b5, the outlet ca acity of the tank may be restricted with re ation to the inlet capacity, so that any desired head may be retained without using the inclined trough. Claims.

1. The combination with the wire art of tank;-

a Fourdrinierpa r machine; of a fe a substantially fleet delivery trough-leading from said tank to said wire part, and substantially the same in width as said Wire part, to deliver a thin. layer of material to the traveling surface of said wire part; and a vertically adjustable delivery outlet from the tank above the level of the wire part,

` mentum, permitting the fibers to settle on the wire.

3. In the art of making paper, the process herein described of fixing the formation of the sheet at the breastroll end of the paper making wire, which consists in deliverlng the stock to the wire at a speed corresponding to the speed of the wire, so that the stock moves with the wire at the start by mo- Imentun1,'permitting the fibers to settle on the Wire, and thereafter, as the formation of the sheet gradually becomes fixed on the wire, gradually imparting mot-ion to the stock by the Wire, without interrupting formation of the sheet.

In testimony whereof, I have signed my name to this specification in theI presence' of two subscribing witnesses.

EDWARD' F. MILLARD.

Witnesses:

M. E. COVENEY, JAS. J. MALONEY. 

